--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/gcc/testsuite/g++.dg/cpp2a/concepts-pr60391.C Thu Feb 13 11:34:05 2020 +0900 @@ -0,0 +1,9 @@ +// PR c++/60391 +// { dg-do compile { target c++14 } } + +namespace N +{ + int operator"" _X(auto) {} // { dg-error "auto|invalid" } +} + +namespace N {}